Really sorry, I am in the middle of moving house and have mixed up a few things on the website. All the CP/M Versions I have are now in the Software Library archive which is here.
https://glasstty.com/wiki/index.php/...ry_Disk_Images
Once the archive is expanded, you will find the Bios 3.5 boot disk with Format.com in the folder called GM555_64K_CPM.
Really sorry about the confusion. I have updated the website to make things clearer.